325 lines
8.3 KiB
C
325 lines
8.3 KiB
C
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/*
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* @(#)IndicReordering.h 1.4 00/03/15
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*
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* (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved
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*
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*/
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#ifndef __INDICREORDERING_H
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#define __INDICREORDERING_H
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#include "LETypes.h"
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#include "OpenTypeTables.h"
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// Characters that get refered to by name...
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enum
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{
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C_SIGN_ZWNJ = 0x200C,
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C_SIGN_ZWJ = 0x200D
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};
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typedef LEUnicode SplitMatra[3];
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struct IndicClassTable
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{
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enum CharClassValues
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{
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CC_RESERVED = 0,
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CC_MODIFYING_MARK_ABOVE = 1,
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CC_MODIFYING_MARK_POST = 2,
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CC_INDEPENDENT_VOWEL = 3,
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CC_CONSONANT = 4,
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CC_CONSONANT_WITH_NUKTA = 5,
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CC_NUKTA = 6,
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CC_DEPENDENT_VOWEL = 7,
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CC_VIRAMA = 8,
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CC_ZERO_WIDTH_MARK = 9,
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CC_COUNT = 10
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};
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enum CharClassFlags
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{
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CF_CLASS_MASK = 0x0000FFFF,
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CF_CONSONANT = 0x80000000,
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CF_REPH = 0x40000000,
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CF_VATTU = 0x20000000,
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CF_BELOW_BASE = 0x10000000,
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CF_POST_BASE = 0x08000000,
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CF_MATRA_PRE = 0x04000000,
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CF_MATRA_BELOW = 0x02000000,
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CF_MATRA_ABOVE = 0x01000000,
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CF_MATRA_POST = 0x00800000,
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CF_LENGTH_MARK = 0x00400000,
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CF_INDEX_MASK = 0x000F0000,
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CF_INDEX_SHIFT = 16
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};
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typedef le_int32 CharClass;
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enum ScriptFlagBits
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{
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SF_MATRAS_AFTER_BASE = 0x80000000,
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SF_REPH_AFTER_BELOW = 0x40000000,
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SF_EYELASH_RA = 0x20000000,
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SF_MPRE_FIXUP = 0x10000000,
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SF_POST_BASE_LIMIT_MASK = 0x0000FFFF,
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SF_NO_POST_BASE_LIMIT = 0x00007FFF
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};
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typedef le_int32 ScriptFlags;
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LEUnicode firstChar;
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LEUnicode lastChar;
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le_int32 worstCaseExpansion;
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ScriptFlags scriptFlags;
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const CharClass *classTable;
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const SplitMatra *splitMatraTable;
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le_int32 getWorstCaseExpansion() const;
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CharClass getCharClass(LEUnicode ch) const;
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const SplitMatra *getSplitMatra(CharClass charClass) const;
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le_bool isVMabove(LEUnicode ch) const;
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le_bool isVMpost(LEUnicode ch) const;
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le_bool isConsonant(LEUnicode ch) const;
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le_bool isReph(LEUnicode ch) const;
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le_bool isVirama(LEUnicode ch) const;
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le_bool isNukta(LEUnicode ch) const;
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le_bool isVattu(LEUnicode ch) const;
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le_bool isMatra(LEUnicode ch) const;
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le_bool isSplitMatra(LEUnicode ch) const;
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le_bool isMpre(LEUnicode ch) const;
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le_bool isMbelow(LEUnicode ch) const;
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le_bool isMabove(LEUnicode ch) const;
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le_bool isMpost(LEUnicode ch) const;
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le_bool isLengthMark(LEUnicode ch) const;
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le_bool hasPostOrBelowBaseForm(LEUnicode ch) const;
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le_bool hasPostBaseForm(LEUnicode ch) const;
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le_bool hasBelowBaseForm(LEUnicode ch) const;
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static le_bool isVMabove(CharClass charClass);
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static le_bool isVMpost(CharClass charClass);
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static le_bool isConsonant(CharClass charClass);
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static le_bool isReph(CharClass charClass);
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static le_bool isVirama(CharClass charClass);
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static le_bool isNukta(CharClass charClass);
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static le_bool isVattu(CharClass charClass);
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static le_bool isMatra(CharClass charClass);
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static le_bool isSplitMatra(CharClass charClass);
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static le_bool isMpre(CharClass charClass);
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static le_bool isMbelow(CharClass charClass);
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static le_bool isMabove(CharClass charClass);
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static le_bool isMpost(CharClass charClass);
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static le_bool isLengthMark(CharClass charClass);
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static le_bool hasPostOrBelowBaseForm(CharClass charClass);
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static le_bool hasPostBaseForm(CharClass charClass);
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static le_bool hasBelowBaseForm(CharClass charClass);
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static const IndicClassTable *getScriptClassTable(le_int32 scriptCode);
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};
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class IndicReordering
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{
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public:
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static le_int32 getWorstCaseExpansion(le_int32 scriptCode);
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static le_int32 reorder(const LEUnicode *theChars, le_int32 charCount, le_int32 scriptCode,
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LEUnicode *outChars, le_int32 *charIndices, const LETag **charTags);
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static void adjustMPres(const LEUnicode *chars, le_int32 charCount, LEGlyphID *glyphs,
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le_int32 *charIndices, le_int32 scriptCode);
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private:
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static le_int32 findSyllable(const IndicClassTable *classTable, const LEUnicode *chars, le_int32 prev, le_int32 charCount);
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};
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inline le_int32 IndicClassTable::getWorstCaseExpansion() const
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{
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return worstCaseExpansion;
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}
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inline const SplitMatra *IndicClassTable::getSplitMatra(CharClass charClass) const
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{
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le_int32 index = (charClass & CF_INDEX_MASK) >> CF_INDEX_SHIFT;
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return &splitMatraTable[index - 1];
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}
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inline le_bool IndicClassTable::isVMabove(LEUnicode ch) const
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{
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return isVMabove(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isVMpost(LEUnicode ch) const
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{
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return isVMpost(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isConsonant(LEUnicode ch) const
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{
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return isConsonant(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isReph(LEUnicode ch) const
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{
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return isReph(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isVirama(LEUnicode ch) const
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{
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return isVirama(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isNukta(LEUnicode ch) const
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{
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return isNukta(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isVattu(LEUnicode ch) const
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{
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return isVattu(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isMatra(LEUnicode ch) const
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{
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return isMatra(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isSplitMatra(LEUnicode ch) const
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{
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return isSplitMatra(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isMpre(LEUnicode ch) const
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{
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return isMpre(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isMbelow(LEUnicode ch) const
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{
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return isMbelow(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isMabove(LEUnicode ch) const
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{
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return isMabove(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isMpost(LEUnicode ch) const
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{
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return isMpost(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isLengthMark(LEUnicode ch) const
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{
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return isLengthMark(getCharClass(ch));
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}
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inline le_bool IndicClassTable::hasPostOrBelowBaseForm(LEUnicode ch) const
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{
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return hasPostOrBelowBaseForm(getCharClass(ch));
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}
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inline le_bool IndicClassTable::hasPostBaseForm(LEUnicode ch) const
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{
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return hasPostBaseForm(getCharClass(ch));
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}
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inline le_bool IndicClassTable::hasBelowBaseForm(LEUnicode ch) const
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{
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return hasBelowBaseForm(getCharClass(ch));
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}
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inline le_bool IndicClassTable::isVMabove(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_MODIFYING_MARK_ABOVE;
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}
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inline le_bool IndicClassTable::isVMpost(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_MODIFYING_MARK_POST;
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}
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inline le_bool IndicClassTable::isConsonant(CharClass charClass)
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{
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return (charClass & CF_CONSONANT) != 0;
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}
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inline le_bool IndicClassTable::isReph(CharClass charClass)
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{
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return (charClass & CF_REPH) != 0;
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}
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inline le_bool IndicClassTable::isNukta(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_NUKTA;
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}
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inline le_bool IndicClassTable::isVirama(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_VIRAMA;
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}
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inline le_bool IndicClassTable::isVattu(CharClass charClass)
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{
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return (charClass & CF_VATTU) != 0;
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}
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inline le_bool IndicClassTable::isMatra(CharClass charClass)
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{
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return (charClass & CF_CLASS_MASK) == CC_DEPENDENT_VOWEL;
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}
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inline le_bool IndicClassTable::isSplitMatra(CharClass charClass)
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{
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return (charClass & CF_INDEX_MASK) != 0;
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}
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inline le_bool IndicClassTable::isMpre(CharClass charClass)
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{
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return (charClass & CF_MATRA_PRE) != 0;
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}
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inline le_bool IndicClassTable::isMbelow(CharClass charClass)
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{
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return (charClass & CF_MATRA_BELOW) != 0;
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}
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inline le_bool IndicClassTable::isMabove(CharClass charClass)
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{
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return (charClass & CF_MATRA_ABOVE) != 0;
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}
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inline le_bool IndicClassTable::isMpost(CharClass charClass)
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{
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return (charClass & CF_MATRA_POST) != 0;
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}
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inline le_bool IndicClassTable::isLengthMark(CharClass charClass)
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{
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return (charClass & CF_LENGTH_MARK) != 0;
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}
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inline le_bool IndicClassTable::hasPostOrBelowBaseForm(CharClass charClass)
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{
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return (charClass & (CF_POST_BASE | CF_BELOW_BASE)) != 0;
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}
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inline le_bool IndicClassTable::hasPostBaseForm(CharClass charClass)
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{
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return (charClass & CF_POST_BASE) != 0;
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}
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inline le_bool IndicClassTable::hasBelowBaseForm(CharClass charClass)
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{
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return (charClass & CF_BELOW_BASE) != 0;
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}
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#endif
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